Endocrine correlates of behavioural oestrus in the female giant panda (Ailuropoda melanoleuca) and associated hormonal changes in the male

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Abstract
Urinary excretion of estrogens and androgens by a pair of giant pandas was monitored by radioimmunoassay during behavioral estrus through 2 successive breeding seasons. The excretion of estrogens by the female was at a maximum during the proceptive period and lower during the period of receptivity. In the 1st breeding season studied, elevated androgen excretion in the male coincided with peak receptivity in the female. Accurate timing of natural mating or artificial insemination apparently could be achieved by monitoring estrogen excretion in the female.

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